40+ liter pack for multi-day alpine trips in the summer. Montbell Balance Light 40. Although the BD and Montbell packs have very similar volumes, the BD has a beefier suspension and padded hip belt and has more features including a crampon patch with straps and a bungee on the top lid, allowing more stuff to be lashed to the outside. It also carries weight better, albeit at a small weight penalty.

~75 liter pack for Alaskan climbs including Denali as well as long, technical winter climbs in the lower 48 (i.e. > 3-4 days). McHale SARC, custom built with light materials, very simple hip belt, no extra zippers, etc. Although a similar volume to the Wild Things Andinista or the CCW Chaos, you can actually fill it up and still carry it very comfortably and it climbs better than either of the other packs in my experience, although at a pound or so weight penalty.

For Denali, bear in mind you will be pulling a sled and/or doing double carries. No need for such a huge pack. I typically carried between 45 and 50 pounds on Denali and pulled about the same, maybe more.

Never been to Alaska but the Black Diamond has been out up to 10 days backpacking/scrambling. The Millet is my default/go-to pack for almost every trip these days because it sucks down/expands well and has modern tool and bladder features.

I had a BD Ice pack and feel it was one of the best packs I have ever owned. It died prematurely after a vicious, unprovoked late night snafflehound attack and some carelessly packed ice screws. Quite a few friends had this pack as well. Colin Haley did use his on Denali, but he also used his Serratus Genie (a pack I also have) for a one day car to car solo of the North Face of Mt Robson, so ymmv.